Black pond turtle

The specific name, hamiltonii, is in honor of Scottish botanist and ichthyologist Francis Hamilton. G. hamiltonii is mainly black with small yellowish or white spots, and a much-elevated carapace, with three interrupted keels or series of nodose prominences corresponding to the vertebral and costal shields. The posterior border of the carapace is strongly serrated in young, but feebly in the adult. The nuchal is moderate, broader posteriorly than anteriorly. The first vertebral is not or scarcely broader anteriorly than posteriorly. The second and third vertebrals are broader than long in the young, nearly as long as broad in the adult, narrower than the costals. The plastron is large, angulate laterally, truncate anteriorly. The posterior lobe of the plastron is much narrower than the opening of the shell, nearly as long as the width of the bridge, deeply notched posteriorly.